Unusual roof construction - and what to do with it

House was built in 1919, although I don't know if the roof is original. I had one side of it retiled in the summer as a matter of urgency as it was leaking. The guy who did it (wouldn't recommend) said he hadn't seen a roof built that way before.

Basically it has a layer of weatherboard which acts as the battens and the clay tiles are hooked over the top overlap. I've done a rough diagram to further explain.


One problem I can see is the weatherboard overlaps are the wrong way round to prevent water getting in if a tile cracks (which plenty are). Then again I suppose it could be better than just having battens(?)

Anyway, I'm going to get the rest of the roof redone soon but just wondered what the best way to do it was. I.e. just leave the construction as is, or get it re-battened, felted etc.

Also, any ideas how much this kind of work would cost for the whole roof. The roofer I had in before muttered some ridiculous amount which I presume was to make me more likely to patch it up.
It's a fair sized 4 bed detached house with red, clay tiles. I've knocked together a quick sketch below.


Cheers,
Chris

New to me were abouts in the country are you ?

catlad said:

New to me were abouts in the country are you ?

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Cornwall.

Roofer, reckoned it was an old French method but hadn't seen it before.

Nope, same as catlad, new to me.

I'd go for a complete reroof, felt, tiles and batons.

terrypin said:

Nope, same as catlad, new to me.

I'd go for a complete reroof, felt, tiles and batons.

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Any idea how much a re-roof would cost?

Cannot possibly say.
You'd have to see the property before giving an idea, size, access, scaffold, type of tile and local prices etc etc are needed.